{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "The hypothesis that copper acquisition plays an essential role in virulence is further corroborated by the findings that a hypovirulent CUF1 - deletant strain of C . neoformans retrieved from infected mice contains almost a 6 - fold lower concentration of intracellular copper than the pathogenic wild - type strain ."}
{"Chemical": ["copper"]}